Date: Wed, 23 Sep 2015 15:27:02 -0700 From: Tim Gustafson <tjg@ucsc.edu> To: Ryan Stone <rysto32@gmail.com> Cc: Michael Fuckner <michael@fuckner.net>, "freebsd-fs@freebsd.org" <freebsd-fs@freebsd.org> Subject: Re: Switching from MFI to MRSAS Message-ID: <CAPyBAS6U_ObeVCQS1b15B3iT1nR%2BHwsA1r72hjgNtRsgOkTuTg@mail.gmail.com> In-Reply-To: <CAFMmRNwMv6ZAWhyBiSwufh1cCxxBYz5aOt4s1_0_MvOR8JZrMA@mail.gmail.com> References: <CAPyBAS4-oRjrybxu81nPO1Xb0WPdYzJRoEZ3t8zjNUrxFsiZpw@mail.gmail.com> <56023C15.7080007@fuckner.net> <CAPyBAS6p_=Ld6yiis00L3GxCFgq7JwUXkvg=mzni3ZHHEC1Z3Q@mail.gmail.com> <5602D9E8.2090903@fuckner.net> <CAPyBAS5TyBYjOp6wRSkpOy35m%2BcQVLn3MNFS3=y2wWYtpjobQw@mail.gmail.com> <CAFMmRNwMv6ZAWhyBiSwufh1cCxxBYz5aOt4s1_0_MvOR8JZrMA@mail.gmail.com>
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> The mrsas driver is interesting. Your RAID volumes show up as da0, da1, > etc, but they really shouldn't. I'm doubtful that TRIM will work here > because the drives are not truly directly attached, even though the mrsas > driver is misleading the kernel into thinking that they are. > > You can always give a try, though. Just to be clear: we have the PERC controller configured in "pass-through" mode, which I understand to mean "HBA" mode. We are not using any of the RAID features of the PERC card. Instead, the server is configured as ZFS-on-root in a RAID 0+1 configuration: pool: tank state: ONLINE scan: scrub repaired 14.5K in 0h13m with 0 errors on Thu Sep 17 20:47:17 2015 config: NAME STATE READ WRITE CKSUM tank ONLINE 0 0 0 mirror-0 ONLINE 0 0 0 mfisyspd0p3 ONLINE 0 0 0 mfisyspd1p3 ONLINE 0 0 0 mirror-1 ONLINE 0 0 0 mfisyspd3p3 ONLINE 0 0 0 mfisyspd2p3 ONLINE 0 0 0 where mfisyspd0, mfisyspd1, mfisyspd2 and mfisyspd3 are Samsung SSDs, not RAID volumes. So in this case, I believe it would be "correct" for the RAID controller to report the devices as "da0", "da1" and so on. -- Tim Gustafson tjg@ucsc.edu 831-459-5354 Baskin Engineering, Room 313A
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